19. B is the chemical symbol of which element?

Boron

Boring

Balkite

Beryllium

20. Zinc (Zn) has an atomic number of 30 and an atomic mass of 65. How many neutrons does a stable atom of Zn have?

30

35

60

95

A scuba driver with a local sheriffs office has been assigned the task of retrieving a sunken car in the Red river. The car is believed to have human remains inside.

Enter your answer in the provided box. A sample of an unknown gas effuses in 14.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. What is the molar mass of the unknown gas

According to the law of conservation of mass, what is the same on both sides of a balanced chemical equation? A. the volume of the substances B. the subscripts C. the total mass of atoms D. the coefficients

Describe how you would prepare 350 ml of 0.100 m c12h22o11 starting with 3.00l of 1.50 m c12h22o11

If 63.99 mL of Ba (OH) 2 is required to neutralize 56.3 mL of 0.0410 molar HCl, what is the molarity of the Ba (OH) 2?

How could one rapidly separate red #40 from zinc oxide? indicate every step.

What is the KE of 750 kg car moving at 25 m/s?

Which of the following is an extensive physical property? viscosity color mass density

Are protons and neutrons the same size? Explain.

3) which is an example of a physical change? a) grinding pepper b) toasting bread c) lighting up a grill d) baking a cake